CVE-2026-96960: Asymmetric resource consumption (amplification) in .NET allows an unauthorized attacker to deny service over a

This month

HIGH 7.5REMOTEWATCHLISTUPGRADEDOWNGRADE

CVE-2026-96960 is a high-severity flaw (CVSS 7.5) affecting .net, .net framework. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Asymmetric resource consumption (amplification) in .NET allows an unauthorized attacker to deny service over a network.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-405
Published	2026-10-13
Last modified	2026-10-22

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Am I affected?

Timeline

2026-10-13Published CVE record published
2026-10-22 22:20 UTCUpdated Record last modified

microsoft .net UPGRADE

Affected: >= 8.0.0 and < 8.0.5 · >= 9.0.0 and < 9.0.21 · >= 10.0.0 and < 10.0.13 · 11.0.0 preview1 · 11.0.0 preview2 · 11.0.0 preview3 · 11.0.0 preview4 · 11.0.0 preview5

Fixed in: 8.0.5, 9.0.21, 10.0.13

Safe to downgrade to: a release before 8.0.0

1. Check installed version

apt-cache policy .net || rpm -q .net || .net --version

2. UPGRADE to 8.0.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade .net

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade .net

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.0.0 (Debian / Ubuntu)

apt-cache madison .net sudo apt install .net=<VERSION_BEFORE_8.0.0> sudo apt-mark hold .net

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list .net sudo dnf downgrade .net-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add .net

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

microsoft .net framework DOWNGRADE

Affected: 4.8.1 · 4.8 · 4.6.2 · 4.7 · 4.7.1 · 4.7.2 · 3.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.5

1. Check installed version

apt-cache policy .net-framework || rpm -q .net-framework || .net-framework --version

2. No fixed release: DOWNGRADE to a release before 3.5 (Debian / Ubuntu)

apt-cache madison .net-framework sudo apt install .net-framework=<VERSION_BEFORE_3.5> sudo apt-mark hold .net-framework

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list .net-framework sudo dnf downgrade .net-framework-<VERSION_BEFORE_3.5> sudo dnf versionlock add .net-framework

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

NuGet (.NET) · System.Security.Cryptography.Xml · FIXED · 10.0.13 · vulnerable: >= 10.0.0, <= 10.0.12 · source

dotnet add package System.Security.Cryptography.Xml --version 10.0.13

Fedora 46 · python-streamlink · FIXED · 8.6.2-1.fc46 · FEDORA-2026-a56fcfdc08 · source

sudo dnf upgrade --advisory=FEDORA-2026-a56fcfdc08

Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source

sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15

Ubuntu 22.04 · dotnet6 · DEFERRED

Ubuntu 22.04 · dotnet8 · FIXED · 8.0.132-8.0.32-0ubuntu1~22.04.1

sudo apt update && sudo apt install --only-upgrade dotnet8 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet8)" ge "8.0.132-8.0.32-0ubuntu1~22.04.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · dotnet8 · FIXED · 8.0.132-8.0.32-0ubuntu1~24.04.1

sudo apt update && sudo apt install --only-upgrade dotnet8 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet8)" ge "8.0.132-8.0.32-0ubuntu1~24.04.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · dotnet10 · FIXED · 10.0.113-10.0.13-0ubuntu1~24.04.1

sudo apt update && sudo apt install --only-upgrade dotnet10 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' dotnet10)" ge "10.0.113-10.0.13-0ubuntu1~24.04.1" && echo PATCHED || echo STILL-VULNERABLE

Alpine 3.22 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.32-r0

apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime

Alpine 3.22 · dotnet9-runtime · FIXED · dotnet9-runtime-9.0.21-r0

apk add --upgrade dotnet9-runtime apk info -v dotnet9-runtime

Alpine 3.23 · dotnet10-runtime · FIXED · dotnet10-runtime-10.0.13-r0

apk add --upgrade dotnet10-runtime apk info -v dotnet10-runtime

Alpine 3.23 · dotnet8-runtime · FIXED · dotnet8-runtime-8.0.32-r0

apk add --upgrade dotnet8-runtime apk info -v dotnet8-runtime

Microsoft .NET Framework 3.5 on Windows 11 version 26H1 · KB5127696 · FIXED · 2.0.50727.9188 AND 3.0.30729.9171 · KB5127696 · source

Install KB5127696 via Windows Update, then verify: Get-HotFix -Id KB5127696

Microsoft .NET Framework 3.5 on Windows Server 2012 · KB5127660 · FIXED · 2.0.50727.8987 AND 3.0.30729.8982 · KB5127660 · source

Install KB5127660 via Windows Update, then verify: Get-HotFix -Id KB5127660

Microsoft .NET Framework 3.5 on Windows Server 2012 R2 · KB5127664 · FIXED · 2.0.50727.8987 AND 3.0.30729.8982 · KB5127664 · source

Install KB5127664 via Windows Update, then verify: Get-HotFix -Id KB5127664

Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607 · KB5126868 · FIXED · 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 · KB5126868 · source

Install KB5126868 via Windows Update, then verify: Get-HotFix -Id KB5126868

Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 · KB5126868 · FIXED · 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 · KB5126868 · source

Install KB5126868 via Windows Update, then verify: Get-HotFix -Id KB5126868

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Related CVEs

CVE-2026-96959 HIGH 7.5 UPGRADE DOWNGRADE Allocation of resources without limits or throttling in .NET allows an unauthorized attacker to deny service o
CVE-2026-96958 HIGH 7.5 UPGRADE DOWNGRADE Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.
CVE-2026-96957 HIGH 8.8 UPGRADE UPGRADE Improper verification of cryptographic signature in .NET allows an unauthorized attacker to bypass a security

References

← Back to latest CVEs